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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
40-(2/d) = 8 // - 8
40-(2/d)-8 = 0
40-2*d^-1-8 = 0
-2*d^-1 = -32 // : -2
d^-1 = 16
-1 < 0
1/(d^1) = 16 // * d^1
1 = 16*d^1 // : 16
1/16 = d^1
d = 1/16
d = 1/16
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